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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e27a2a654ceb1ff0445148ebe6fd5d0875f3b0b15a05c94700fd12554e34ff' 
  AND token = 'M22jMTBG7kSZqodH4Rg8BtLLBaRKSne54orChlx7C/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}